1 files changed, 77 insertions, 0 deletions
diff --git a/js/src/jit/x86/SharedICHelpers-x86-inl.h b/js/src/jit/x86/SharedICHelpers-x86-inl.h
new file mode 100644
index 0000000000..2ab41c287a
--- /dev/null
+++ b/js/src/jit/x86/SharedICHelpers-x86-inl.h
@@ -0,0 +1,77 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef jit_x86_SharedICHelpers_x86_inl_h
+#define jit_x86_SharedICHelpers_x86_inl_h
+
+#include "jit/BaselineFrame.h"
+#include "jit/SharedICHelpers.h"
+
+#include "jit/MacroAssembler-inl.h"
+
+namespace js {
+namespace jit {
+
+inline void EmitBaselineTailCallVM(TrampolinePtr target, MacroAssembler& masm,
+                                   uint32_t argSize) {
+#ifdef DEBUG
+  // We assume during this that R0 and R1 have been pushed.
+  // Store frame size without VMFunction arguments for debug assertions.
+  masm.movl(FramePointer, eax);
+  masm.subl(StackPointer, eax);
+  masm.subl(Imm32(argSize), eax);
+  Address frameSizeAddr(FramePointer,
+                        BaselineFrame::reverseOffsetOfDebugFrameSize());
+  masm.store32(eax, frameSizeAddr);
+#endif
+
+  // Push frame descriptor and perform the tail call.
+  masm.pushFrameDescriptor(FrameType::BaselineJS);
+  masm.push(ICTailCallReg);
+  masm.jump(target);
+}
+
+inline void EmitBaselineCallVM(TrampolinePtr target, MacroAssembler& masm) {
+  masm.pushFrameDescriptor(FrameType::BaselineStub);
+  masm.call(target);
+}
+
+inline void EmitBaselineEnterStubFrame(MacroAssembler& masm, Register scratch) {
+#ifdef DEBUG
+  // Compute frame size. Because the return address is still on the stack,
+  // this is:
+  //
+  //   FramePointer
+  //   - StackPointer
+  //   - sizeof(return address)
+
+  masm.movl(FramePointer, scratch);
+  masm.subl(StackPointer, scratch);
+  masm.subl(Imm32(sizeof(void*)), scratch);  // Return address.
+
+  Address frameSizeAddr(FramePointer,
+                        BaselineFrame::reverseOffsetOfDebugFrameSize());
+  masm.store32(scratch, frameSizeAddr);
+#endif
+
+  // Push the return address that's currently on top of the stack.
+  masm.Push(Operand(StackPointer, 0));
+
+  // Replace the original return address with the frame descriptor.
+  masm.storePtr(ImmWord(MakeFrameDescriptor(FrameType::BaselineJS)),
+                Address(StackPointer, sizeof(uintptr_t)));
+
+  // Save old frame pointer, stack pointer and stub reg.
+  masm.Push(FramePointer);
+  masm.mov(StackPointer, FramePointer);
+
+  masm.Push(ICStubReg);
+}
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_x86_SharedICHelpers_x86_inl_h */